Meyer Sound USW-1P User manual

Operating Instructions
USW-1P
(Serial Numbers 981000 and above)
Self-Powered Subwoofer
Copyright © 1997
Meyer Sound Laboratories, Inc.
All rights reserved
PN: 05.078.008.01 B
Keep these important operating instructions.

2
Contents
Pour indiquer les risques
résultant de tensions
dangereuses
Zu die gefahren von
gefährliche spanning zeigen
Important operating
instructions
Pour indequer important
instructions
Zu wichtige betriebs-
anweisung und unter-
haltsanweisung zeigen
Frame or chassis
Masse châssis
Rahmen oder chassis
Protective earth ground
Terre de protection
Die schutzerde
Para indicar azares provengo
de peligroso voltajes
Para indicar importante
funcionar y mantenimiento
instrucciones
Armadura o chassis Tierra proteccionista
These symbols indicate important safety or operating features in this booklet and on the chassis
Dangerous voltages:
risk of electric shock
Symbols Used
Introduction 3
AC Power 3
The Modular Rear Panel 5
Amplification, Limiting, and Cooling System 6
Rigging 6
Full-Range Systems 7
Verifying Driver Polarity 9
Troubleshooting 1 0
Safety Summary 1 1
Rear Panel and Input Modules Drawings 1 2
Dimensions Back Cover
Declaration of Conformity According to ISO/IEC Guide and EN 45014
Safety: EN60065: 1994
EMC: EN55103-1 emmission
EN55103-2 immunity
Name: Meyer Sound Laboratories, Inc.
Address: 2832 San Pablo Avenue
Berkeley, California 94702-2204, USA
The Manufacturer:
Conforms to the following Product Specifications:
Declares that the product:
The product herewith complies with the requirements
of the Low Voltage Directive 73 / 23 / EEC and
the EMC Directive 89 / 336 / EEC.
Office of Quality Manager
Berkeley, California USA
October 1, 1994
Environmental Specifications for
Meyer Sound Electronics Products:
Operating temperature: 0oto + 45o
Nonoperating temperature: < -40o C or > +75oC
Humidity: to 95% at 35oC
Operating Altitude: to 4600 m (15,000 ft)
Nonoperating altitude: to 6300 m (25,000 ft)
Shock: 30g 11 msec half-sine
on each of 6 sides
Vibration: 10 Hz to 55 Hz (0.010m
peak-to-peak excursion)
UL
C
UL
®®
LISTED
3K59
COMMERCIAL
AUDIO SYSTEM
Product Name: UPA-1P, UPA-2P, UM-1P, USW-1P, UM-100P
Product Options: All
European Office:
Meyer Sound Lab. GmbH
Carl Zeiss Strasse 13
56751 Polch, Germany
Made by Meyer Sound Laboratories
Berkeley, California USA

3
Introduction
The Integrated Design
TheMeyerUSW-1Pself-poweredsubwooferiscomposedof:
•two15-inchconedrivers.
•phase-corrected,optimizedcontrolelectronics;
•atwo-channelamplifier(550wattstotal).
Thedrivers,controlelectronics,andamplifierareintegrated
intoacompactenclosure.TheUSW-1PpairedwiththeUPA-P
Seriesisideallysuitedforcompact,high-poweredPAapplica-
tions,suchasmainPA,churches,5.1systems,andtheatres.
TheUSW-1PismorethanapoweredversionoftheMeyer
USW-1,ThepoweredUSW-1Pimplementsthesesignificant
designimprovements:
• Thegainstructurebetweenthecontrolelectronicsand
amplifierisperfectlymatched.
• Theamplifierisoptimizedforthesystem,providingsub-
stantialpowerwithoutendangeringthedrivers.
• Theintegrateddesignsimplifiessetupandinstalla-
tion,eliminatesampracks,andextendsthedurability
andreliabilityoftheloudspeaker.
AC Power
The USW-1P uses a PowerCon locking 3-pole AC mains
connectorthatpreventsinadvertentdisconnection. Theunit
musthavethecorrectpowerplugfortheACpowerinthearea
inwhichitwillbeused.
Engagement
2
1
2
1
3
Separation
WhenACpowerisappliedtotheUSW-1P,anIntelligentAC
supplyautomaticallyselectsthecorrectoperatingvoltage,al-
lowingtheUSW-1Ptobeusedinternationallywithoutmanu-
allysettingvoltageswitches.TheIntelligentACsupplyper-
formsthefollowingprotectivefunctionstocompensatefor
hostileconditionsontheACmains:
•suppresseshighvoltagetransientsuptoseveralkilo-
volts
• filtersEMI(radiofrequenciesandnoisepresentonthe
ACline)
• sustainsoperationduringlow-voltageperiods,which
minimizesaudiodiscontinuity
• providessoft-startpower-up,whicheliminateshigh
inrushcurrent
TheUSW-1Pcanwithstandcontinuousvoltagesupto264V
andallowsanycombinationofvoltagetoGND(i.e.Neutral-
Hot-GND,Hot-Hot-GND).Continuousvoltageshigherthan
264Vmaydamagetheunit.
Voltage Requirements
TheUSW-1Poperatessafelyandwithoutaudiodiscontinuity
iftheACvoltagestayswithintherange88–264V,47–63Hz.
AfterapplyingACpower,thesystemismutedwhilethecir-
cuitrychargesupandstabilizes.Aftertwoseconds,theOn/
Temp.LEDontheuserpanelilluminatesgreen,thesystem
unmutesandisreadytopassaudiosignals. IftheOn/Temp.
LEDdoesnotilluminateorthesystemdoesnotrespondto
audioinputaftertenseconds,consulttheTroubleshooting
section.
TheUSW-1P’spowersupplyusesstoredenergytocontinue
functioning for about 10 AC cycles if the voltage decreases
below 88V (a condition known as brownout). The precise
lengthoftimetheunitfunctionsduringbrownoutdepends
ontheoperatinglevelandhowlowthevoltagedrops.Theunit
turnsoffifthevoltagedoesnotincreaseabove88Vfor1to
5seconds. IftheUSW-1Pshutsdownduetobrownout,the
powersupplyautomaticallyturnson ifthevoltagereturnsto
thenormaloperatingrange.IftheUSW-1Pdoesnotturnback
onaftertenseconds,consulttheTroubleshooting section.
NOTE: We recommend that the supply be operated at
least a few volts away from the upper and lower
bounds of the operating range to avoid possible
shutdown.

4
Current Requirements
EachUSW-1Prequiresapproximately3Arms@115V(1.5
Arms@230V)forproperoperation,allowinguptofiveUSW-
1Ptobepoweredfromone15Acircuit.However,werecom-
mendpoweringnomorethanthree USW-1Psper15Abranch
to allow a 30% margin for peak voltages. The USW-1P
presentsadynamicloadtotheACmainswhichcausesthe
amountofcurrenttofluctuatebetweenquietandloudoperat-
inglevels.ThisaffectsthenumberofUSW-1Psthatcanbe
usedforagivenbreakertype.Sincedifferenttypesofcables
andcircuitbreakersheatupandtripatvaryingrates,itis
essentialtounderstandthetypesofcurrentratingsandhow
theycorrespond to circuit breakerand cable specifica-
tions.
ThemaximumcontinuousRMScurrentisthemaximum
RMScurrentoveradurationofatleast10seconds.Itisused
tocalculatethetemperatureincreaseincables,whichisused
toselectcablesthatconformtoelectricalcodestandards.Itis
alsousedtoselecttheratingforslow-reactingthermalbreak-
ers.
ThemaximumburstRMScurrentisthemaximumRMS
currentoveraonesecondduration.Itisusedtoselectthe
ratingformostmagneticbreakers.
Themaximuminstantaneouspeakcurrentduringburstis
usedtoselecttheratingforfast-reactingmagneticbreakers
and to calculate the peak voltage drop in long AC cables
accordingtotheformula
Vpkdrop = Ipk x Rtotal cable
Usethetable below as aguidetoselectcables and circuit
breakerswithappropriateratingsforyouroperatingvoltage
USW-1P Current Ratings
V511V032V001
SMReldIA52.0A31.0A3.0
S2.8A 1.4A 3.2AMRsuounitnoC.xaM
SMRtsruB.xMa3.2A 1.6A 3.7A
tsruBgnirudkaePxMa5.0A 2.5A 5.8A
Todeterminetheminimumtotalservicepowerrequiredbya
systemofUSW-1Ps,orotherMeyerself-poweredspeakers,
addtheirmaximumcontinuousRMScurrentstogether.We
recommendallowinganadditional30%abovetheminimum
amperagetopreventpeakvoltagedropsattheserviceentry
andnuisancetripping.
Power Connector Wiring
UsethefollowingACcablewiringdiagramtocreateinterna-
tionalorspecial-purposepowerconnectors:
AC cable color code
Ifthecolorsreferredtointhediagramdon'tcorrespondtothe
terminalsinyourplug,usethefollowingguidelines:
• Connectthebluewiretotheterminalmarkedwithan
Norcoloredblack.
• Connectthebrownwiretotheterminalmarkedwithan
Lorcoloredred.
• Connect the green and yellow wire to the terminal
markedwithanE(or )orcoloredgreen(orgreenand
yellow).
Safety Issues
Do not use a ground-lifting adapter or cut the AC
cable ground pin.
Keep all liquids away from the USW-1 to avoid
hazards from electrical shock.
Do not operate the unit with worn or frayed cables;
replace them immediately.
If the USW-1 will be installed outdoors, contact
Meyer Sound for information about the optional rain
hood which protects the amplifier and heat sink from
rain. Weather protection for the drivers is also avail-
able.

5
The Modular Rear Panel
Therearpanelofthe USW-1P hastwoslotsformodules.
ThetopslotcontainstheAudioInputModule;thebottom
slot contains the optional Remote Monitoring System™
(RMS) Module. A blank plate covers the bottom slot if
RMSisnotinstalled.
udio Input
There are three, interchangeable Audio Input Modules
with optimized connectors and controls for different app-
lications.Eachmodulehasa24VFanconnectortopoweran
optionalfan(seefansectiononpage6).
Each module uses a three-pin, female XLR audio input
connectorwitha10kΩbalancedinputimpedancewiredwith
thefollowingconvention:
Pin1 — 220kΩtochassisandearthground(ESDclamped)
Pin2 —Signal+
Pin3 —Signal-
Case — Earth(AC)groundandchassis
Pins 2 and 3 carry the input as a differential signal. Use
standardaudiocables withXLRconnectorsforbalanced
signalsources.AsingleaudiosourcecandrivemultipleUSW-
1Pswithaparalleledinputloop,creatinganunbufferedhard-
wiredloopconnection,withnegligiblelossinsignallevel.
Forexample,sincetheinputimpedanceofoneUSW-1Pis10
kΩ,looping20USW-1Pproducesabalancedinputimped-
ance of 500Ω. With a 150Ωaudio source, the 500Ωload
resultsinonlya2.28dBloss.
For drawings of the modules refer to page 12.
Looping Audio Input Module
Thisstandardmoduleusesabalanced,femaleXLRconnector
foraudioinputandamaleXLRloopconnectortointerconnect
multiplespeakers.Theaudioinputconnectorishardwired
withpin2hottocomplywithaudioindustrystandards.The
loopconnector,wiredinparalleltotheaudioinput,transmits
the input signal even if the USW-1P is turned off for any
reason.
Summing Audio Input Module
ThismodulehastwobalancedfemaleXLRconnectors.The
secondfemaleXLRconnectorfunctionsasasumminginput.
Applyingasignal tooneoftheinputsresultsinanormal
signallevel.Utilizingbothsumminginputscreatesacor-
rectlysummedmonosignalwitheachinput6dBbelowthe
levelofasingleinput.Thisisaneffectivemethodfordistrib-
utingbothsidesofastereosignaltoasingleUSW-1Pwithout
requiringexternallevelcontrol.
Looping, Polarity, and Attenuating Audio
Input Module
Thismodulehasabalanced,femaleXLRaudioinputconnec-
tor,amaleXLRloopconnector,aninputpolarityswitch,and
alevelattenuatorknob.Theinputpolarityswitchoffersa
convenientmethodofreversingthepolarityofthespeaker.
Whentheinputpolarityswitchisintheup(+)position,pin
2ishotrelativetopin3,resultinginapositivepressurewave
whenapositivesignalisappliedtopin2.Whentheswitchis
down(-),pin3ishotrelativetopin2,resultinginapositive
pressurewavewhenapositivesignalisappliedtopin3.The
levelattenuatorknoboperatesbetween0dB(nolevelat-
tenuation)inafullyclockwisepositionto–12dBinafully
counterclockwiseposition.
Remote Monitoring System
TheUSW-1PcanbeequippedtooperatewiththeRemote
MonitoringSystem(RMS)networkandsoftwareapplica-
tion.RMSdisplayssignalandpowerlevels,driverstatus.
limiter activity, the state of the polarity switch, attenuator
level, and amplifier temperature for all speakers in the
networkonaWindows-basedPC.RMScanalsobeconfig-
uredtoenablespeakermuting.RMSisanexcellentfield-
diagnostictoolthatremovestheguessworkfromtrouble-
shootingduringaperformance.AllMeyerSpeakerswith
RMScanbeintegratedonthesamenetwork.Installingan
RMSmodulerequiresonlyaPhillipsscrewdriver.Contact
MeyerSoundformoreinformationaboutRMS.
Amplification, Limiting, and
Cooling System
mplification and Limiting
EachdriverintheUSW-1Pispoweredbyonechannelofa
proprietaryMeyerSoundamplifierutilizingcomplementary
powerMOSFEToutputstages(classAB,bridged).TheUSW-1P
employs two separate methods of limiting: Excursion
Limiting which protects the drivers from over excursion
andSubChannelLimitingwhichpreventsthedriversfrom
damageduetothermaloverload.
LimiteractivityfortheExcursionandSubchannelisindi-
catedbytwoyellowLimitLEDsontherearpanel(theEXC.
Limit LED is above the SUB limit LED). See page 12 for a
diagramoftheuserpanel.
TheUSW-1Pperformswithinitsacousticalspecifications
andoperatesatanormaltemperatureifthelimitLEDsareon
fornolongerthantwoseconds,andoffforatleastonesecond.
DifferentialInputs

6
IfeitherLEDremainsonforlongerthanthreeseconds,that
channelincurstheseconsequences:
• Increasingtheinputlevelwillnotincreasethevolume.
• Thesystemdistortsduetoclippingandnonlinear
driveroperation.
WhiletheUSW-1Plimitersfullyprotectthesystemunder
overloadconditionsandexhibitsmoothsoniccharacteris-
tics;werecommendthatyoudonotintentionallydrivethe
USW-1Pintocontinuouslimitingtoattaincompressionef-
fects.
Forapplicationswherelargeamountsofcompressionare
required,werecommendusinganoutboardcompressor/lim-
iterforgreatercontroloflimitandcompressoreffects.
Amplifier Natural Convection Cooling System
TheUSW-1P’samplifieremploysanaturalconvectioncool-
ing system that is cooled by the air flowing over the
heatsink.Allowforproperventilationoffreshairwhen
usingthespeakerintightlypackedconditions.
Ifthetemperatureoftheheatsinkreaches85°C(185°F),the
On/Temp.LEDontherearpanelturnsfromgreen(On)tored
(Temp.)andthelimiterthresholdisloweredtoasafelevelto
preventthesystemfromoverheating.Underhightemperature
conditionstheoutputlevelisreduced6dB.Whentheheatsink
temperaturedecreasesto75°C(167°F),theOn/Temp.LED
changesfromredtogreenandthelimiterthresholdreturnsto
normal.
The heatsink reaches temperatures up to 185°F
(85°C) during normal operation. Use extreme
caution when approaching the rear of the cabinet.
Fan ssembly Kit
Whileconvectioncoolingisadequateformostapplications,
USW-1Pswhendrivenintocontinuouslimitingundersevere
temperatureconditions,orwhereventilationisrestricted,
maybenefitfromtheoptionalfankitwhichincreasesairflow
tomaintainasafeoperatingtemperature.
Theeasy-to-installfan,poweredbythe24VFanrearpanel
connector,blowsairdirectlyontotheheatsink.Thefanspeed
increasesastheheatsinktemperaturerises,whichmaintainsa
safeoperatingtemperaturewithminimalfannoise.Contact
MeyerSoundtoorderthefankit.
Power Supply Fan
Thepowersupplyiscooledbyasinglesmallinternalfanthat
turnsonlowwhentheunitisfirstpoweredup.Thefandoubles
itsspeedasthesystemisdrivenwithaudio.Sincethefan
drawsairinfrom,andexhaustsitoutthebackofthecabinet,
theremustbeatleastsixinchesclearancebehindthecabinet,
andadequateairflow.
Rigging
TheUSW-1Pweighs137lb(62kg).Themaximumrecom-
mendedloadforanUSW-1Pwithaircraftpanfittingsis420
lb(191 kg).Thisworkingloadisbasedona5:1safetyfactor.
TheUSW-1Phasthreeriggingplatesontop;eachplateis
capableofsupportingthefullworkingloadofthecabinet.
There are four types of interchangeable rigging plates, each
fastenedbysixPhillipsscrews:
• aircraftpanfittings(ringandstud)
•3/8”-16nutplates
• M-10x1.5metricnutplates
• blankplates(ifnoriggingbracketsarerequested)
NOTE: Units with nut plates are rated for the weight of
one cabinet only.
Riggingloadratingsassumeastraighttensilepullandthatthe
cabinetisinnewconditionwithaircraftpanfittings.Ifthese
conditionsarenotmet,theloadratingscanbereducedsignifi-
cantly.Loadratingscanalsobereducedbyage,wear,and
damage.Itisimportanttoinspecttherigginghardwareregu-
larlyandreplacewornordamagedcomponentsimmediately.
NOTE: All Meyer Sound products must be used in
accordance with local, state, federal, and industry
regulations. It is the owners and/or users responsibility
to evaluate the reliability of any rigging method for
their application. Rigging should be done only by
experienced professionals.

7
Full Range Systems
Introductory Concepts
The USW-1P is used to add low frequency SPL to sound
systems.ItisoptimizedtobeusedwiththeMeyerUPA-P
seriesself-poweredloudspeakers.Itcanalsobeusedwith
allMeyerSoundloudspeakers.Forinformationonintegrat-
ing the USW-1P with the UPA-P, see the UPA-P Series
OperatingInstructions.ForinformationonusingtheUSW-1P
withotherMeyerSoundproductspleasecontactMeyerSound
TechnicalSupport.
UsingtheUSW-1Pinafull-rangesystemisstraightforwardbut
thefollowingconceptsareimportanttoconsiderbeforein-
stallingasystem.
Room Loading
TheplacementoftheUSW-1Pinaroomoraspaceiscritically
importanttotheresponseofthespeakersystem.AUSW-1P
hungintheairwithnoboundaryconditionswouldnotaddany
SPLfromroomloading.
AUSW-1Pplacedonafloor(half-spaceloading)willgain
approximately6dBcomparedtoitsfreefieldresponse.
6 dB low frequency gain compared to free field.
AUSW-1Pplacedonafloorandagainstawall(quarter-space
loading)willgainapproximately12dBcomparedtoitsfree
fieldresponse.
12 dB low frequency gain compared to free field.
AUSW-1Pplacedonthefloorinacorner(one-eighthspace
loading)willgainapproximately18dBcomparedtoitsfree
fieldresponse.
18 dB low frequency gain compared to free field.

8
-8
-6
-4
-2
0
2
4
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
Distance in meters between wall and acoustical center of speaker.
dB SPL relative to free-space response.
SPL vs. Distance to Boundary
Aswehaveseenonthepreviouspage,theplacementofa
USW-1Ponafloororagainstaboundarysignificantlychanges
thelowfrequencyresponse when compared to freefield
measurementofthesamespeaker.
ThegraphbelowrepresentsthechangeindBSPLforfrequen-
ciesunder125HzofasingleUSW-1Pasitismovedaway
fromaboundary.Distancemeasuredinmeters,isbasedonthe
distancefromthewallbehindthespeakertotheacoustical
centeroftheUSW-1P.AlldBSPLmeasurementsaremade
withthemicrophoneonaxistothespeaker.
Tobetterunderstandthegraphabove,imagineaUSW-1P
withawallbehindit.AsyoumovetheUSW-1Pawayfrom
the wall the graph above shows how the response of the
speakerwillchange.ForexampleiftheUSW-1Pisplaced1
meterfromawallandismeasuredonaxistothespeaker,you
willseea-5dBchangeinthelowfrequencyasillustratedby
thedottedlinesonthegraph.
Polarity
WiththeUSW-1Pinclose-proximityto,andcoplanarwith,
theUPA-P,orotherMeyerSpeakers,bothspeakersshouldbe
settothesame polarity.Separatingthesubwoofersandmain
cabinetsinaspeakersystembymorethan5feetmayrequire
polarityreversaloradelaylinetocompensateforthepropa-
gationdelaybetweenthespeakersandthemeasurementposi-
tion.
Measurement and Corre tion Tools
Itisrecommendedthateventhemostcarefullyassembled
soundsystemsbeanalyzedwithprecisemeasurementtools.
Werecommendusing the Meyer SIM®Sound Analyzer
andCP-10ParametricEqualizerto
• choose,place,andarrayspeakers;
• measurepropagationdelaysbetweenspeakerstoset
thecorrectpolarityanddelaytimes;
• measureandequalizevariationsinfrequencyre-
sponsecausedbytheacousticalenvironmentandthe
placementandinteractionofspeakers.
The VX-1:
TheVX-1isanidealcontroloptionforUSW-1Psystems.The
VX-1isastereovirtualcrossoverwhichallowstheuserto
adjustthegain,switchbetweenstereoandmonodistribution
oftwoinputsandmakeshelvingEQadjustmentstotheleft
andrightsidesofthesystem.
USW-1P with the UP -P
TheUSW-1PandUPA-Pcanbeconfiguredinawidevariety
ofarrayconfigurationstosuitspecificapplicationneeds.
RefertotheUPA-POperatingInstructionsforrecommended
arrays;orforadditionalsystemdesignideas,contactMeyer
SoundforthefollowingTechNotesdocumentsonUPA-P
arraydesign:
• TwoUPA-1Ps@70°HorizontalSplay
(Doc #: 01.990.101.90 A)
• TwoUPA-1Ps@85°HorizontalSplay
(Doc #: 01.990.101.91 A)
• TwoUPA-2PsTight-pack(Doc#:01.990.101.92A).
• ThreeUPA-2PsTight-pack(Doc#:01.990.101.93A).
These documents are also available on the Meyer Sound
website:http://www.meyersound.com.
Distance to Boundary vs. dB SPL below 125 Hz

9
Verifying Driver Polarity
Incorrectdriverpolarityimpairssystemperformanceand
maydamagethedrivers.AllMeyerloudspeakersareshipped
withthedriversincorrectalignment.
Polarity In djacent Loudspeakers
Usethefollowingtestproceduretoverifythepolaritybe-
tweentwoUSW-1P.
1. EstablishareferenceUSW-1P,aspeakerthathasnot
beentamperedwithordamaged.Markthisspeakeras
thereference.
2. PlacetheUSW-1Pyouwanttotestnexttothereference
USW-1P.
3. Placeameasurementmicrophone3feetfromthespeak-
ersontheaxisbetweenthespeakers.Seedrawingat
bottomofpage.
4. Connectasignalsourcetoreferencespeakerandnote
thefrequencyresponseandoveralllevel.
5. ApplythesamesignaltotheUSW-1Pundertestwith
thefirstspeakerstillconnected.
Thepolarity is correctif the frequencyresponse remains
constantwitha5to6dBSPLincreaseinamplitude.Broad-
bandcancellation(decreasedoveralllevel)indicatespolarity
reversal between cabinets. A 2 to 3 dB SPL increase may
indicatethatoneofthedriversintheUSW-1Pundertestisout
ofphase,inthiscase,proceedtothenextsection.
Since polarity reversal causes excessive driver
excursion at high source levels, use moderate
levels when conducting these tests.
Polarity within a USW-1P
Ifthedriverorcircuitwiringhasbeenremovedordisas-
sembleditisessentialtocheckthepolaritybetweendrivers
andbetweenadjacentloudspeakers.
Usethefollowingtestproceduretoverifypolaritybetween
driversinthesameloudspeaker:
1. PlacethereferenceUSW-1PandtheUSW-1P under
testsidetosidesothatthedriversarefacingthesame
direction.
2. Place a measurement microphone 3 feet from the
speakersontheaxisbetweenthespeakers.Seedraw-
ingatbottomofpage.
3. ConnectafullrangesignaltothereferenceUSW-1P
loudspeakerandnotethefrequencyresponseand
soundpressurelevel.
4. ComparethereferenceandtestUSW-1Presults
oneatatime.Asignificantdecreaseinenergyfrom
40to100HzintheUSW-1Pundertestindicatesa
driverreversal.ContactMeyerSoundTechnical
SupportforinformationonServiceCenterorfield
correction.
5. IfthereferenceandUSW-1Pundertesthavesimilar
responses,thenthereisnointernalpolarityerrorwithin
theloudspeaker.
3 feet
Reference
USW-1P
Front of Speaker
Front of Speaker
Microphone
USW-1P
under test

10
Troubleshooting
Thissectionsuggestsseveralpossiblesolutionstosomecom-
mon problems encountered by USW-1P users and is not
intendedtobeathoroughtroubleshootingguide.Contact
MeyerSoundforadditionalinformationanddocumentation.
The On/Temp. LED does not illuminate, there
is no audio, and the power supply fan is
off.
1. MakesuretheACpowercableisthecorrecttypeforthe
regionalvoltageandthatitissecurelyconnectedtothe
ACinletthenunplugandreconnecttheACcable.
2. UseanACvoltmetertoverifythattheACvoltageis
withintheranges88–264V,47–63Hz.
3. CallMeyerSoundTechnicalSupport.
The On/Temp. LED is illuminated but there is
no sound.
1. Verifythattheaudiosource(mixer,EQ,delay)issend-
ingavalidsignal.
2. Make sure the XLR cableis securelyfastened to the
XLRaudioinputconnector.
3. VerifythattheXLRcableisfunctioningbysubstituting
another cable or by using the cable in question in a
workingsystem.
4. Sendtheaudiosignaltoanotherspeakertoinsuresignal
presenceandthattheleveliswithintheproperrange.
Turnthesourceleveldownbeforereconnectingthe
audioinputandincreasethelevelslowlytoavoida
suddenblastofsound.
5. Ifpossible,monitortheaudiosourcewithheadphones.
Hum or noise is produ ed by the speaker.
1. Disconnecttheaudioinput.Ifthenoisepersists, the
problemiswithintheUSW-1P.Inthiscasereturnthe
unittothefactoryornearestauthorizedservicecenter.If
thehumceases,thenoiseoriginatessomewhereearlier
inthesignalpath.
2. Make sure the XLR cableis securelyfastened to the
XLRaudioinputconnector.
3. Sendtheaudiosignaltoanotherspeakertoinsuresignal
presenceandthattheleveliswithintheproperrange.
Turnthesourceleveldownbeforereconnectingthe
audioinputandincreasethelevelslowlytoavoida
suddenblastofsound.
5. Humornoisecanbeproducedbyagroundloop.Since
theUSW-1Piseffectivelyground-lifted,theloopmust
bebrokenelsewhereinthesystem.
The audio produ ed by the speaker is dis-
torted or ompressed but the limit light is
not illuminated.
1. Make sure the XLR cableis securelyfastened to the
XLRaudioinputconnector.
2. Sendtheaudiosignaltoanotherspeakertoinsurethat
theleveliswithintheproperrange.Turnthesourcelevel
downbeforereconnectingtheaudioinputandincrease
thelevelslowlytoavoidasuddenblastofsound.
3. Monitortheaudiosourcewithheadphones.
The audio produ ed by the speaker is highly
ompressed and the limit light is onstantly
red.
1. Turndowntheleveloftheinputsignaltothespeaker
system.
There is sound but it is does not seem to
be at full power and the On/Temp. LED is
yellow.
Thisoccursinconditionswheretheheatsinktemperature
reaches85°C(185°F),indicatingthattheamplifieristher-
mallyoverloaded.Thelimiterthresholdhasdroppedtoasafe
level,sotheaudiolevelisreduced.
1. Makesurethereisenoughclearanceabove,below,and
behindtheunit.
2. Makesurethereissufficientairflowaroundtheunit.
3. Avoidexposingtheheatsinktodirectsunlightifthe
ambienttemperatureishigh.
4. Iftheambienttemperatureisgreaterthan30°Candthis
conditionoccursfrequently,contactMeyerSoundto
ordertheoptionalFanKit.
See the section Amplification, Limiting, and Cooling
System on page 6 for a complete discussion about the
coolingsystem.
There is no sound, the On/Temp. LED is
dim or off, and the power supply fan is on
high speed.
Thisextremelyrareeventoccurswhenthepowersupplyover-
heats,causinga1-2minuteinterruptioninoperation.Theunit
turnsonagainwhenthepowersupplyhascooledsufficiently.
1. Makesurethereisatleastsixinchesclearancebehind
theunit.
2. Makesurethereissufficientairflowaroundtheunit.
See the section Amplification, Limiting, and Cooling
System onpage6foramoreinformationaboutthepower
supply’sinternalfanandcoolingsystem.

11
• Toreducetheriskofelectricshock,disconnecttheloudspeaker
fromtheACmainsbeforeinstallingaudiocable.Reconnectthe
powercordonlyaftermakingallsignalconnections.
• Connecttheloudspeakertoatwo-pole,threewiregroundingmains
receptacle.Thereceptaclemustbeconnectedtoafuseorcircuit
breaker.Connectiontoanyothertypeofreceptacleposesa
shockhazardandmayviolatelocalelectricalcodes.
• Do not install the loudspeaker in wet or humid locations
withoutusingweatherprotectionequipmentfromMeyerSound.
• Do not allow water or any foreign object to get inside the
loudspeaker.Donotputobjectscontainingliquidon,ornear,
theunit.
• Toreducetheriskofoverheatingtheloudspeaker,avoidexpos-
ingittodirectsunlight.Donotinstalltheunitnearheatemitting
appliances,suchasaroomheaterorstove.
• Thisloudspeakercontainspotentiallyhazardousvoltages.Do
notattempttodisassembletheunit.Theunitcontainsnouser
serviceableparts.Repairsshouldbeperformedonlybyfactory
trainedservicepersonnel.
English Français
Deuts h Español
Safety Summary
• UmdieGefahreineselektrischenSchlagesaufeinMinimumzu
reduzieren,denLautsprechervomStromnetztrennen,bevor
ggf.einAudio-Schnittstellensignalkabelangeschlossenwird.
DasNetzkabelerstnachHerstellungallerSignalverbindungen
wiedereinstecken.
• DerLautsprecheraneinegeerdetezweipoligeDreiphasen-
Netzsteckdoseanschließen.DieSteckdosemußmiteinem
geeignetenAbzweigschutz(SicherungoderLeistungsschalter)
verbunden sein. Der Anschluß der unterbrechungsfreien
StromversorgunganeinenanderenSteckdosentypkannzu
StromschlägenführenundgegendieörtlichenVorschriften
verstoßen.
• DerLautsprechernichtaneinemOrtaufstellen,andemsiemit
WasseroderübermäßighoherLuftfeuchtigkeitinBerührung
kommenkönnte.
• Daraufachten,daßwederWassernochFremdkörperindas
Innere den Lautsprecher eindringen. Keine Objekte, die
Flüssigkeitenthalten,aufodernebendieunterbrechungsfreie
Stromversorgungstellen.
• UmeinÜberhitzendemLautsprecherzuverhindern,dasGerät
vordirekterSonneneinstrahlungfernhaltenundnichtinder
NähevonwärmeabstrahlendenHaushaltsgeräten(z.B.Heizgerät
oderHerd)aufstellen.
• ImInnerendiesemLautsprecherherrschenpotentiellgefährliche
Spannungen.Nichtversuchen,dasGerätzuöffnen.Esenthält
keinevomBenutzerreparierbarenTeile.Reparaturendürfen
nurvonausgebildetemKundenienstpersonaldurchgeführt
werden.
• Pourréduirelerisqued’électrocution,débrancherlaprise
principaledel’haut-parleur,avantd’installerlecâbled’interface
allantàl’audio.Nerebrancherleblocd’alimentationqu’après
avoireffectuétouteslesconnections.
• Branchezl’haut-parleurdansuneprisedecourantà3dérivations
(deux pôles et la terre). Cette prise doit être munie d’une
protectionadéquate(fusibleoucoupe-circuit).Lebranchement
danstoutautregenredeprisepourraitentraînerunrisque
d’électrocution et peut constituer une infraction à la
réglementationlocaleconcernantlesinstallationsélectriques.
• Nepasinstallerl’haut-parleurdansunendroitoùilyadel’eau
ouunehumiditéexcessive.
• Ne pas laisser de l’eau ou tout objet pénétrer dans l’haut-
parleur.Nepasplacerder´cipientscontenantunliquidesurcet
appareil,niàproximitédecelui-ci.
• Pouréviterunesurchauffedel’haut-parleur,conserver-laà
l’abridusoleil.Nepasinstalleràproximitéd’appareilsdégageant
delachaleurtelsqueradiateursouappareilsdechauffage.
• Cehaut-parleurcontientdescircuitshautetensionprésentant
undanger.Nejamaisessayerdeledémonter.Iln’yaaucun
composantquipuisseêtreréparéparl’utilisateur.Toutesles
réparationsdoiventêtreeffectuéespardupersonnelqualifiéet
agrééparleconstructeur.
• Parareducirelriesgodedescargaeléctrica,desconectedelared
elaltoparlanteantesdeinstalarelcabledeseñalizaciónde
interfazdelasegnale.Vuelvaaconectarelconductorflexible
de alimentación solamente una vez efectuadas todas las
interconexionesdeseñalizatción.
• Conecteelaltoparlanteauntomacorrientebipolarytrifilarcon
neutrodepuestaatierra.Eltomacorrientedebeestarconectado
alaproteccióndederivaciónapropiada(yaseaunfusibleoun
disyuntor).Laconexiónacualquierotrotipodetomacorriente
puede constituir peligro de descarga eléctrica y violar los
códigoseléctricoslocales.
• Noinstaleelaltoparlanteenlugaresdondehayaaguaohumedad
excesiva.
• Nodeje queenelaltoparlanteentre aguani ningúnobjeto
extraño.Nopongaobjetosconlíquidosencimadelaunidadni
cercadeella.
• Parareducirelriesgodesobrecalentamiento,noexpongala
unidad a los rayos directos del sol ni la instale cerca de
artefactosqueemitencalor,comoestufasococinas.
• Estealtoparlantecontiene nivelesdevoltaje peligrososen
potencia.Nointentedesarmarlaunidad,puesnocontiene
piezasquepuedanserrepardasporelusuario.Lasreparaciones
deben efectuarse únicamente por parte del personal de
mantenimientocapacitadoenlafábrica.

12
Rear Panel and Optional Modules
User Panel with RMS option and Standard Looping Audio Input Module.
Looping, Polarity, and Attenuating Input Module
Summing Audio Input Module
The user panel and optional modules are described on page 5 of this guide.
AC Input
100-240V
~
50-60Hz 4A MAX
RMS LEDs
RMS Network
Connectors
Fan Connectors
Rain Hood
screw
Hi Limit LED
Low Limit LED
PowerCon Locking
AC Mains Inlet
Rain Hood
screw
Rain Hood
screw Rain Hood
screw
On/Temp. LED
24VFan
-
+
Loop
Input
On /Temp.
Limit
Earth /
Chassis
Case
220k Ω
GND Circuit 1
2
3
1
2
3
Looping Audio Input
Push
Network
Service
Wink Reset
Activity
Remote Monitor System
!
Meyer Sound, Berkeley, CA. USA
UX RATING LABEL
A/W 30.076.069.01,
REVISION. A
11/12/97 cmc
CAUTION : See instruction manual
ATTENTION : Voir le cahier d'instruction
Female XLR Input
Male XLR Loop
On /Temp.
24VFan
-
+
Input
Limit
Earth /
Chassis
Case
220k Ω
GND Circuit 11
10k Ω
Ω
Balanced
+
-
33
22
Looping Polarity & Attn. Audio Input
Push Push
Loop
-6
-9
-12 0
-3
Attn dB
Polarity
+
-
High Limit LED Low Limit LED
On /Temp.
Summing Inputs
24VFan
-
+
Inputs
Limit
Earth /
Chassis
Case
220k Ω
1k Ω
Ω
Each
Each
GND Circuit 11
25k Ω
Ω
Balanced
+
-
33
22
Summing Audio Input
Push Push
High Limit LED Low Limit LED

13
Dimensions
(in in hes)
Meyer Sound Laboratories, Inc.
2832 San ablo Avenue
Berkeley, California 94702
Telephone: 510 - 486 - 1166
FAX: 510 - 486 - 8356
E-mail: t[email protected]
http://www.meyersound.com
ACInput
100-240V
~
50-60Hz 4A MAX
!
MeyerSound,Berkeley,CA. USA
CAUTION :See instruction manual
ATTENTION :Voir le cahier d'instruction
24VFan
-
+
Loop
Input On/ Temp.
Limit
Earth/
Chassis
Case
220k Ω
GNDCircuit 1
2
3
1
2
3
Looping Audio Input
Push
Network
Service
Wink Reset
Activity
Remote Monitor System
!
CAUTION
RISKOF ELECTRIC SHOCK-- DO NOT OPEN
!
WARNING:
To reduce the risk of fire
orelectric shock do not expose this
applianceto rain or moisture.
CAUTION:
Theheatsink surface may reach high temperatures
whilein use. To ensure proper operation, allow at least 6 inches
clearancefrom this surface and adequate ventilation.
Thisequipment must be grounded.
HOT
CAUTION
CALIENTE
CHAUD
HEISS
Screw
for
fan
Screw
for
fan
!
WARNINGS:
THISAPPARATUS MUST BE EARTHED. IMPORTANT:
Thewires in this mains lead are coloured in accordance with the
followingcode --green-and-yellow: earth --blue:neutral --brown: live
!
ATENCIÓN
:
ACCESOINTERNO SOLO AUTORIZADO A PERSONAL TÉCNICO CALIFICADO
ACHTUNG
:
GEHÄUSENICHT ÖFFNEN WARTUNG UND REPARATUR NUR DURCH ELEKTROFACHKRÄFTE
ATTENTION
:
ENTRETIENET REPARATIONS INTERNES NE SONT AUTORISEES QU'AU PERSONNEL TECHNIQUE QUALIFIÉ
Screw
for
fan
Screw
for
fan
12.75 ± .12
Typical
2.63
31.00
21.56
9.77
11.00
11.00
11.00
11.88
15.50
19.25
21.30
14.00
± .12
C
L
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